Finding the Fourth Proportional to 11,686.16, 17,520.60 and 4,286.72

Step by Step Solution

1. Step 1: Write the proportion equation
   11,686.16 : 17,520.60 = 4,286.72 : x
2. Step 2: Convert to fraction form
   11,686.16/17,520.60 = 4,286.72/x
3. Step 3: Cross multiply
   11,686.16x = 17,520.60 × 4,286.72
4. Step 4: Simplify right side
   11,686.16x = 75,105,906.43
5. Step 5: Solve for x
   x = 75,105,906.43/11,686.16
6. Step 6: Final answer
   x = 6,426.91